Daylight developer.



A. HAMBURGER n H. IMHO?.

DAYLIGHT DEVELUPER..

APPLICATION FILED Nov.1a, 1908.

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sra-iras retentir ariesG ALFRED HAMBURGER AND HEINRICH IMHOF, OF VIENNA,AUSTRIA-HUNGARY.

DAYLIGHT DEVELOPER.

clear specification, reference being had to the nccompailying drawing.

,the subject matter of the present invention is a daylight developer inwhich the placing or laying in of plates can also be otter-ted.

rEhe essential feature of the invention consists in the fact that thevessel receiving the developing or tixng fluid which vessel is providedat opposite sides with red windows, is composed of two parts capable ofbeing drawn out and connected in a lightproof manner, between whichparts by cX- cluding the light, preferably in using a, leather tube thepla-cing` or laying in of the plates can take place.

@n the drawing which represents, by way of example, a form ofconstruction of the subject mattei' of the invention, Figure l shows across section, .T 2 shows a longitudinal section, Fig. shows the plan,ifi -l and 5 show perspective views and llig. t3 shows a detail.

rl`he vessel intended for the reception of the developing orfixing-fluid consists of two trough or basin-shaped parts o and 7)similarly formed, each face or bottom of which shows a red window li.The edges /it of these parts of the vessel facing each other are outvard y formed like tianges and can be pressed against each ot-her byclamps n. letiveen the langes f: packing pieces Z are placed which areformed as guides for a displaceable glass plate m, which divides thechamber formed by the parts of the vessel placed one over the other,into two watertight separate compartments. The abovemeutioned parts u,7), are inserted into a tube c, which is impervious to light, in such amanner that their faces project out through openings in the tube whichopenings are placed opposite each other. The edge of each one of theseopenings is held against the wall of the respective vessel-part a. or 7)in a light-proof manner. the said parts each having a groove c intowhich the edge v' is pressed by means of rectangular Specification ofLetters Patent.

Application filed November 18, 1908.

Patented June 15, 1909.

Serial No. 463,216.

frame, the ledges or rails (l of which can be tightened against eachother. This tightening of the frame is facilitated by the ends of twoopposite pieces having each a tapered continuation j (Fig. t3) and thetwo other joining pieces for the reception of this continuation haveeach a corresponding opening g, so that by drawing the la mentionedpieces together the frame is contracted on all sides. rlie finalposition of the frameparts can then be secured in a manner which can beeasily relaxed, for example, be secured by cones or keys. Each of thetwo vessel parts c and 7) is provided with a supply holder o in whichthe developing fluid employed can be collected when not in use. eininlet pipe or funnel y) is joined to the bottom of the supply holder andis of an undulated or spiral shape in order to prevent the light frompenetrating` into the interior of the vessels o, when filling thesupply-holder.

The manner of employing this invention is as follows: rlhe vessel partsa and D of the developer are, in the first place, brought into theposition illustrated by F ig. d and are held apart by brackets i. rl`henthe back is placed in through the opening s of the tube c (which openingis provided with an elastic band) into the chamber formed between thevessel parts a and 7). The operators arms are now stretched through theopenings s the edge of which by reason of the rubber band pressesclosely to the arms so that no light can penetrate into the tube. rlheremoval of the photographie plate within the apparatus described, at thesame time preventing the admission of light can therefore be etl'ected.The photographic plate t is placed upon the glass plate m, the bracketsfr are removed and both parts c and b are connected by the clamps n.While the vessel is in the upright position the developing fluid ispoured through the funnel or tube 71 into the supply-holder and thefunnel p is then closed. lf the vessel is now placed in a horizontalposition, the fluid contained in the supply-holder flows over thephotographic plate and the developing can now be done in the mannerknown. For the purpose of easily observing the progress of this processthe holdervcan be brought into such a position, say perpendicular, sothat light can shine through. lf the developing procis finished, thefunnel or pouring-in tube is turned around downwardly and the developingfluid is allowed to flow off. In the same way as with the developing`fluid water can now be poured into the supplyholder and the platerinsed. After the water is removed and the clamps n are relaxed, theplate or slide m is drawn out by means of the handle u and thephotographie plate descends into the lower vessel-part l). r-rfterremoving the slide and tightening the clamps for pressing` both vesselparts ci and 7) together, the fluid employed for xing is poured into thesupply-holder of the vesselpart l) and the fixing of the photograph isthen effected. The removal of the completely finished plate is mostadvantageously effected after the removal of the tube c.

its the plate m is preferably held in watertight manner one of the partscan be used for developing and the other for fixing at the same time.

-Iaving now described our invention what we claim and desire to secureby Letters Patent is l. An appliance for developing photographsconsisting of a vessel formed of two parts each provided with red glasssurfaces, said parts being connected together by lightproof material andcapable of being fixed l together and at a distance from each other, alight-proof aperture being provided in the lightproof material throughWhich the plates can be passed into or withdrawn from either of the saidparts.

2. A photographic daylight developer in which a vessel consisting of twoparts having red glass surfaces is provided, said parts being connectedtogether by light-proof material and having attached to them holdersinto which the fluid used for developing can b'e placed when not in use.

3. A photographic daylight developer having two parts with red windowsconnected together by light-proof material and divided by a glass plate,each part being in separate communication with a holder into which thedeveloping fluid can be placed, said holders having flexible tubes forfilling and emptying purposes.

In testimony whereof we affix our signatures in presence of twowitnesses.

ALFRED H MBUR( t lll R. HEINRICH IMHOF.

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